Loaded turbocharger turbine wastegate control linkage joints

Abstract

An assembly can include a turbine housing that includes a bore, a wastegate seat and a wastegate passage that extends to the wastegate seat; a bushing disposed at least in part in the bore; a rotatable wastegate shaft received at least in part by the bushing; a wastegate plug that extends from the wastegate shaft; a control arm operatively coupled to the wastegate shaft; a control link operatively coupled to the control arm; a pin that forms a joint between the control arm and the control link; and a biasing element coupled to the pin and to the control link.

What is claimed is: 
     
       1. An assembly comprising:
 a turbine housing that comprises a bore, a wastegate seat and a wastegate passage that extends to the wastegate seat; 
 a bushing disposed at least in part in the bore; 
 a rotatable wastegate shaft received at least in part by the bushing; 
 a wastegate plug that extends from the wastegate shaft; 
 a control arm operatively coupled to the wastegate shaft; 
 a control link operatively coupled to the control arm; 
 a pin that forms a joint between the control arm and the control link; and 
 a biasing element wherein the biasing element comprises legs that apply a compression force therebetween wherein one of the legs is disposed in an opening of the pin and another one of the legs is in contact with an end surface of the control link. 
 
     
     
       2. The assembly of  claim 1  comprising an actuator operatively coupled to the control link. 
     
     
       3. The assembly of  claim 1  wherein the opening of the pin is a bore opening of the pin. 
     
     
       4. The assembly of  claim 1  wherein the opening of the pin comprises a through bore. 
     
     
       5. The assembly of  claim 4  wherein the through bore comprises a stepped through bore. 
     
     
       6. The assembly of  claim 1  wherein the leg disposed in the opening of the pin defines a first leg axis and wherein the leg in contact with the end surface of the control link defines a second leg axis. 
     
     
       7. The assembly of  claim 6  wherein the first leg axis is substantially parallel to the second leg axis. 
     
     
       8. The assembly of  claim 1  wherein the biasing element comprises at least one coil spring. 
     
     
       9. The assembly of  claim 1  wherein the biasing element comprises at least one coil spring disposed between the legs that apply the compression force therebetween. 
     
     
       10. The assembly of  claim 1  wherein the opening of the pin comprises a bore and wherein the biasing element contacts a surface of the bore. 
     
     
       11. The assembly of  claim 10  wherein the biasing element biases the pin in an opening in the control link. 
     
     
       12. The assembly of  claim 11  wherein the pin contacts a surface that defines the opening in the control link. 
     
     
       13. The assembly of  claim 1  wherein the biasing element comprises a spring. 
     
     
       14. The assembly of  claim 1  wherein the end surface of the control link comprises a grove that receives the another one of the legs of the biasing element. 
     
     
       15. The assembly of  claim 14  wherein the groove orients the another one of the legs of the biasing element with respect to the one of the legs of the biasing element that is received in the opening of the pin. 
     
     
       16. The assembly of  claim 15  wherein the one of the legs of the biasing element that is received in the opening of the pin is rotatable in the opening. 
     
     
       17. The assembly of  claim 16  wherein movement of the control link rotates the one of the legs of the biasing element in the opening of the pin. 
     
     
       18. A turbocharger comprising:
 a compressor assembly; 
 a center housing assembly; 
 a turbine assembly that comprises a control arm that controls position of a wastegate plug with respect to a wastegate seat; 
 a control link operatively coupled to the control arm; 
 an actuator operatively coupled to the control link; 
 a pin that forms a joint between the control arm and the control link; and 
 a biasing element wherein the biasing element comprises legs that apply a compression force therebetween wherein one of the legs is disposed in an opening of the pin and another one of the legs is in contact with an end surface of the control link.